# Chapter 5 Resources

This contains a set of reference links related to the content presented in the chapter. I added this file to the code repo to give readers of the print book quick access to sites with supporting content.

+ [Amazon Web Services: AppSync](https://aws.amazon.com/appsync/)
+ [Couchbase](https://www.couchbase.com/)
+ [Firebase Cloud Firestore](https://firebase.google.com/products/firestore/)
+ [Firebase Realtime Database](https://firebase.google.com/products/realtime-database/)
+ [MDN IndexedDB API](https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API)
+ [Live Data in the Service Worker](https://developers.google.com/web/ilt/pwa/live-data-in-the-service-worker)
+ [Offline Storage for Progressive Web Apps](https://developers.google.com/web/fundamentals/instant-and-offline/web-storage/offline-for-pwa)
+ [IndexedDB Stores](https://developer.mozilla.org/en-US/docs/Web/API/IDBObjectStore)
+ [SweetAlert2](https://sweetalert2.github.io/)
+ [Chrome, the Background Sync API and exponential backoff](https://notes.eellson.com/2018/02/11/chrome-the-background-sync-api-and-exponential-backoff/)